651678641 has 8 divisors (see below), whose sum is σ = 681778944. Its totient is φ = 622254880.

The previous prime is 651678623. The next prime is 651678647. The reversal of 651678641 is 146876156.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 651678641 - 2¹⁰ = 651677617 is a prime.

It is a super-2 number, since 2×651678641² = 849370102271213762, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 651678592 and 651678601.

It is not an unprimeable number, because it can be changed into a prime (651678647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 167165 + ... + 171018.

It is an arithmetic number, because the mean of its divisors is an integer number (85222368).

Almost surely, 2^651678641 is an apocalyptic number.

It is an amenable number.

651678641 is a deficient number, since it is larger than the sum of its proper divisors (30100303).

651678641 is a wasteful number, since it uses less digits than its factorization.

651678641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 338271.

The product of its digits is 241920, while the sum is 44.

The square root of 651678641 is about 25527.9971991537. The cubic root of 651678641 is about 866.9841589395.

The spelling of 651678641 in words is "six hundred fifty-one million, six hundred seventy-eight thousand, six hundred forty-one".